Search found 2776 matches
- Thu Oct 03, 2019 2:47 pm
- Forum: Vensim
- Topic: Improving the modelling of annual decisions used for optimization
- Replies: 6
- Views: 208
Re: Improving the modelling of annual decisions used for optimization
There are two options: 1. Replace the IF THEN ELSE structure with a VECTOR LOOKUP over time (I think the sample model for VECTOR LOOKUP illustrates this). Then you will have an array of time points, like decisionTime : (t1-t10) with gValue[decisionTime] = 3.5, 2.4, 1.9, 4.2 ... You can then specify ...
- Tue Oct 01, 2019 5:48 pm
- Forum: Vensim
- Topic: Help - remove lines
- Replies: 4
- Views: 128
Re: Help - remove lines
In a custom graph, change the x-division and y-division settings.
For the graph tool, you can change the global setting on the Scaling tab of the Control Panel.
For the graph tool, you can change the global setting on the Scaling tab of the Control Panel.
- Tue Oct 01, 2019 5:26 pm
- Forum: Vensim
- Topic: Help - remove lines
- Replies: 4
- Views: 128
Re: Help - remove lines
Presumably you want to remove all but one. :) Without a legend, it's hard to be sure what this is. You need to do one of the following: - unload datasets using the Control Panel's datasets tab - deactivate subscripts using the Subscript Control - edit the custom graph definition using the Control Pa...
- Sat Sep 28, 2019 9:01 pm
- Forum: Ventity
- Topic: Units (Millions and Billions)
- Replies: 8
- Views: 302
Re: Units (Millions and Billions)
Got it - thanks! I'll put in a ticket and we'll investigate.
- Fri Sep 27, 2019 3:53 pm
- Forum: Vensim
- Topic: BUG: Vensim Manuals inaccessible in Mac 8.0.3
- Replies: 10
- Views: 269
Re: BUG: Vensim Manuals inaccessible in Mac 8.0.3
I'll see if we can get a different skin from the Help system vendor.
- Thu Sep 26, 2019 1:43 pm
- Forum: Ventity
- Topic: Units (Millions and Billions)
- Replies: 8
- Views: 302
Re: Units (Millions and Billions)
Thanks. Two requests:
- can you post a screenshot of the save dialog, showing the Excel filename to be used? (Email to us at info at ventity.biz if easier.)
- the text of the extended error message - this will be on the clipboard after you click OK on the "path is not of legal form" dialog.
- can you post a screenshot of the save dialog, showing the Excel filename to be used? (Email to us at info at ventity.biz if easier.)
- the text of the extended error message - this will be on the clipboard after you click OK on the "path is not of legal form" dialog.
- Wed Sep 25, 2019 6:36 pm
- Forum: Ventity
- Topic: Units (Millions and Billions)
- Replies: 8
- Views: 302
Re: Units (Millions and Billions)
Speculation: the path error has something to do with the location where you're saving the file.
- Wed Sep 25, 2019 6:34 pm
- Forum: Ventity
- Topic: Units (Millions and Billions)
- Replies: 8
- Views: 302
Re: Units (Millions and Billions)
The M is definitely a bug - I've put in a ticket for it.
How did you generate the "path not of legal form" error? The export command is working for me.
How did you generate the "path not of legal form" error? The export command is working for me.
- Wed Sep 25, 2019 1:42 pm
- Forum: Ventity
- Topic: Units (Millions and Billions)
- Replies: 8
- Views: 302
Re: Units (Millions and Billions)
Where do you need these numbers? (Charts, tables, data grid?)
If you copy-paste or export the values to Excel or csv, you'll get the raw numbers.
If you copy-paste or export the values to Excel or csv, you'll get the raw numbers.
- Wed Sep 25, 2019 4:46 am
- Forum: Vensim
- Topic: Help please-Calculating number of reinforcing/balancing loops passing a variable in VENSIM PLE
- Replies: 6
- Views: 194
- Wed Sep 25, 2019 3:54 am
- Forum: Vensim
- Topic: Help please-Calculating number of reinforcing/balancing loops passing a variable in VENSIM PLE
- Replies: 6
- Views: 194
Re: Help please-Calculating number of reinforcing/balancing loops passing a variable in VENSIM PLE
This is something we're exploring but it's not on the road map yet.
- Wed Sep 25, 2019 3:54 am
- Forum: Vensim
- Topic: Help please-Calculating number of reinforcing/balancing loops passing a variable in VENSIM PLE
- Replies: 6
- Views: 194
Re: Help please-Calculating number of reinforcing/balancing loops passing a variable in VENSIM PLE
Unfortunately knowing the number of loops isn't helpful, because many weak loops could be dominated by one strong loop.
You might try this link instead: https://papers.ssrn.com/sol3/papers.cfm ... id=3114407
You might try this link instead: https://papers.ssrn.com/sol3/papers.cfm ... id=3114407
- Tue Sep 24, 2019 3:26 pm
- Forum: Vensim
- Topic: “InstallVensimPLE.dmg” is damaged and can’t be opened. You should move it to the Trash.
- Replies: 2
- Views: 121
Re: “InstallVensimPLE.dmg” is damaged and can’t be opened. You should move it to the Trash.
If the problem persists after a fresh download, let us know.
- Mon Sep 23, 2019 7:58 pm
- Forum: Vensim
- Topic: Creating hyperlink
- Replies: 1
- Views: 80
Re: Creating hyperlink
Use the Comment tool:
- Mon Sep 23, 2019 5:00 pm
- Forum: Vensim
- Topic: Help please-Calculating number of reinforcing/balancing loops passing a variable in VENSIM PLE
- Replies: 6
- Views: 194
Re: Help please-Calculating number of reinforcing/balancing loops passing a variable in VENSIM PLE
You can use the loops tool to count the total number of loops, but not their polarity.
Can you describe your purpose for doing this?
I think what you may really need is eigenvector analysis: https://pdfs.semanticscholar.org/58b4/c ... 845f28.pdf
Can you describe your purpose for doing this?
I think what you may really need is eigenvector analysis: https://pdfs.semanticscholar.org/58b4/c ... 845f28.pdf
- Sun Sep 22, 2019 4:25 pm
- Forum: Vensim
- Topic: Converting flow into lookup
- Replies: 1
- Views: 91
Re: Converting flow into lookup
I can't view the model remotely, but you probably just need to change the type of the variable to "lookup".
See:
https://vensim.com/lookups-in-vensim/
http://vensim.com/documentation/usr08.htm
See:
https://vensim.com/lookups-in-vensim/
http://vensim.com/documentation/usr08.htm
- Sun Sep 22, 2019 4:20 pm
- Forum: Vensim
- Topic: Time Setting
- Replies: 3
- Views: 131
Re: Time Setting
Chapter 18 of the User Guide is a good example of a model calibrated against data:
http://vensim.com/documentation/usr18.htm
http://vensim.com/documentation/usr18.htm
- Sat Sep 21, 2019 3:02 pm
- Forum: Vensim
- Topic: Time Setting
- Replies: 3
- Views: 131
Re: Time Setting
Same file for sure. What you want is a dynamic structure that replicates the data over the historical period, then runs into the future for projections.
- Fri Sep 20, 2019 3:33 pm
- Forum: Vensim
- Topic: Uploading Data onto Vensim PLE
- Replies: 27
- Views: 5504
Re: Uploading Data onto Vensim PLE
I'm on the road and can't modify the model, plus I don't have the data. But the structure you already have for "fit degression rate" is exactly what you need. "FIT degression rate DATA" is the lookup and "FIT degression rate" is the value looked up from the data, by time.
- Fri Sep 20, 2019 3:28 pm
- Forum: Vensim
- Topic: Help - please
- Replies: 2
- Views: 108
Re: Help - please
Is this a data variable? If so, the line won't extend past the end of the data.
- Tue Sep 17, 2019 9:18 pm
- Forum: Vensim
- Topic: sensitivity analysis (vensim)
- Replies: 35
- Views: 1407
Re: sensitivity analysis (vensim)
I think the "wrong type" error only occurs if a variable is not a constant (the "not found" is misleading). Most likely causes are setting the constant subtype to unchangeable (with ==), setting the type to initial(), or simply specifying a nonnumeric expression for the variable, like x*y or 3/4.
- Tue Sep 17, 2019 6:01 pm
- Forum: Vensim
- Topic: sensitivity analysis (vensim)
- Replies: 35
- Views: 1407
Re: sensitivity analysis (vensim)
I think the second error is a consequence of the first. It's not finding Yearly Depreciation Factor, and therefore not adding it as an input. Are there other parameters in the vsc?
Does Yearly Depreciation Factor have an array dimension? It's not set to "Initial" type by accident?
Does Yearly Depreciation Factor have an array dimension? It's not set to "Initial" type by accident?
- Tue Sep 17, 2019 5:03 pm
- Forum: Vensim
- Topic: sensitivity analysis (vensim)
- Replies: 35
- Views: 1407
Re: sensitivity analysis (vensim)
Sounds like your control file (.vsc) specifies a variable that doesn't exist or isn't constant.
- Sun Sep 15, 2019 5:12 pm
- Forum: Vensim
- Topic: Uploading Data onto Vensim PLE
- Replies: 27
- Views: 5504
Re: Uploading Data onto Vensim PLE
It would be exactly the same structure as you have for FIT Degression Rate.
- Fri Sep 13, 2019 5:56 pm
- Forum: Vensim
- Topic: Uploading Data onto Vensim PLE
- Replies: 27
- Views: 5504
Re: Uploading Data onto Vensim PLE
Normally you would specify the data file in the Data Sources... field, on the Advanced tab of the simulation control dialog (Model>Simulate menu).
However, PLE doesn't do data variables, so you'd have to use another lookup.
However, PLE doesn't do data variables, so you'd have to use another lookup.